Naphthyl containing guanidines



lew M United States Patent NAPHTHYL coNiAIinNG GUANIDINES Robert Geoth'ey William Spickett, Harpenden, Graham John Durant, Welwyn Garden City, and Patrick 3,159,675 Patented Dec. 1, 1964 thiourea in the form of a mineral acid salt such as, preferably, the sulfate salt. The reaction is conveniently carried out in water or in aqueous alkanol, for example ethanol or methanol, at elevated temperature such as at Michael Guy Bavin, Letchworth, England, assignors to 5 g f i gg i i i g f g ig Smith Kline & French Laboratories, Philadelphia, Pa., a on to ours pre era Y a o o a corporation of Pennsylvania The sulfate salt of the guanldlne 18 isolated and con- No Drawing. Filed Feb. 7, 1962, Ser. No. 171,593 verted to the free base by treatment with a base such as 5 Claims. (Cl. 260-564) sodium ethoxide in ethanol as described hereabove.

The alkylamine starting materials are either known to This invention relates to novel guanidine derivatives th t or are prepared by reacting the appropriate naph- Cofltaifliflg a p y Y- The compounds Of this thol, thionaphthol or naphthylamine with chloroacetoniinvention have pharmacological activity, in Particular trile in the presence of a base such as an alkali metal sympathetic nervous System blocking and yp carbonate preferably potassium carbonate, sodium hyvi y. In adifioll Compounds of this invention have dride or a tri-lower alkylamine such as triethylamine. diuretic and antibacterial activity. The resulting cyanomethyl compound is reduced with The novel guanidine derivatives of this invention are lithium lumi um hydride to give the desired amine. represented by the following structural formula: Alternatively the amine starting materials are prepared Formula I by reacting the naphthol, thionaphthol or naphthylamine with an alkylene dihalide followed by treatment with potassium phthalimide. The phthalimido derivative yields Y-ANHO\ the amine starting material upon treatment with-hydrazine. NH: The following examples are not limiting but are illus- When: trative of the compounds of this invention and the proc- Y is O, S or NR; esses for their preparation. A is an alkylene chain of 2 to 4 carbon atoms having Example I at least 2 carbon atoms separating the hetero atoms to which it is attached and To 8.5 g. of S-methyl thlouromum sulfate in 100 ml. f Water is added 11.0 of 2-(1-naphthyloxy)ethylam1ne. R 18 hydrogen or lower alkyl. 0 g

The mixture ls heated at reflux for two hours, then 18 Optionally the p y nucleus of the compounds of allowed to cool to room temperature. The solid which Formula I may have inert Substituents Such as lower y separates is filtered, washed with cold Water, dried and lower alkoxy or halogen. recrystallized from methanol-isopropanol to give 2-(1- Advantageous compounds of this invention are those naphthyloxy)ethylguanidine sulfate, M.P. 240-242" C. of Formula I in which Y is oxygen. e The free base is obtained by dissolving the sulfate salt A prefered compound of this invention is 2-(1-naphin aqueous ethanol, adding sodium ethoxide, filtering and thyloxy)ethylguanidine. evaporating.

The term lower alkyl where used herein denotes Example 2 gr llavmg} preferaplylinethyl t By the procedure of Example 1, 11.0 g. of 2-(2- of t S M yl thiouronlum sulfate in aqueous solution. The product gamc morgtmc a t. S is 2-(Z-naphthyloxy)ethylguanidine sulfate, M.P. 24sare, for example, malelc, fumarlc, ascorblc, acetic, cltrlc, 2470 methane sulfomc, ethane dlsulfonicand benzene sulfon c. An ethanol Solution of the sulfate salt is treated with f g ifi fi g g l g f g i E 3 g a solution of sodium ethoxide in ethanol. Filtration and y roc orlc, y ro ronnc, y no 10, p osp one an sulfuric acids. The compounds of this invention can be evaporauon glves 2 (2 naphthyloxy)ethylguamdme' isolated as their inorganic salts. A salt can be converted Example 3 into the free base by treatment of a solution of the salt 5 1 h h 1 23 g), potassium carbonate (26 and 111 ethanol Wlth a base Such asssodlum ethOXlde- The methyl ethyl ketone ml.) are refluxed with stirring. free base can be converted into other pharmaceutically T h mixture i added 345 f a br0mopropionitri1e acceptable, nontoxic, acid addition salts by treating with in 30 1, f th l th l k Th mixture i flu d the appropriate organic or inorganic acid advantageously for four hours, then concentrated in vacuo. The residue in a Solvent Such as ethanol, ether acetolle- 55 is diluted with water and extracted with ether. The ether The guanidine derivatives of this invention are prepared extracts are washed with 20% sodium hydroxide solution according to the following procedure: I and water and dried over anhydrous potassium carbon- NHz Y-ANH [0Has0 /so4= NH NHa YA-NHo YANHO\ NH; NHz

The terms Y and A are as defined hereabove.

The naphthy1oxy-, naphthylthioand naphthylaminoalkylamine starting material is reacted with S-methyl 0 ate. Removing the ether and distilling the residue gives 2-( l-naphthyloxy) propionitrile.

The nitrile (16 g.) is dissolved in dry ether ml.)

and added to lithium aluminum hydride (4 g.) in dry ether (200 ml.). The mixture is refluxed for one hour, then cooled and treated with wet ether and water. Extraction into hydrochloric acid, washing the extracts with petroleum ether, neutralizing with 20% sodium hydroxide, extracting with ether and concentrating and distilling the ether extracts affords 2-(l-naphthyloxy)propylamine.

A mixture of 19.8 g. of 2-(1-naphthyloxy) propylamine and 14.0 g. of S-methyl thiouronium sulfate in water is refluxed for two hours, then cooled and the solid which precipitates is collected and recrystallized from isopropanolmethanol to yield 2-(1-naphthyloxy)propylguanidine sulfate.

The free base is obtained by treating an ethanol solution of the salt with a small excess of sodium ethoxide, filtering and concentrating.

Treating a sample of 2(l-naphthyloxy)propylguanidine with an equimolar amount of maleic acid in ethanol gives, after evaporation of the solvent, 2-( l-naphthyloxy) propylguanidine maleate.

Example 4 A mixture of 28.8 g. of l-naphthol, 100 g. of potassium carbonate and 300 ml. of methyl ethyl ketone is refluxed during the addition of 150 g. of 1-bromo-3- chloropropane. The resulting mixture is refluxed for 48 hours, cooled, filtered and concentrated in vacuo. The residue is diluted with water and extracted with ether. The extracts are washed with 10% caustic soda solution and water and then dried over potassium carbonate. Evaporation of the ether and distillation of the residue gives 1-chloro-3-(1-naphthyloxy)propane.

A solution of 20 g. of 1-chloro-3-(1-naphthy1oxy)propane, 18 g. of potassium phthalimide and 50 ml. of dimethylformamide is heated at 120 C. for two hours. The mixture is poured into ice water. The solid which forms is collected, washed with water and dried to give 3-(1-naphthyloxy)propyl phthalimide.

This phthalimido compound (15.0 g.) is dissolved in ethanol and treated with 10 m1. of hydrazine hydrate. The solution is heated on the steam bath for 30 minutes, then filtered. The filtrates are concentrated in vacuo to give 3 l-naphthyloxy) propylamine.

By the procedure of Example 1, 8.5 g. of S-methyl thiouronium sulfate is reacted with 12.0 g. of 3-(1- naphthyloxy)propylamine to give 3-(1-naphthyloxyJpropylguanidine sulfate.

Example 5 By the procedure of Example 4, Z-naphthol is reacted with l-bromo-4-chlorobutane to give 1-chloro-4-(2-naphthyloxy)butane which is refluxed in dimethylformamide with potassium phthalimide to yield 4-(2-naphthyloxy) butylphthalimide.

This phthalimido compound is heated with hydrazine in ethanol to give 4-(2-naphthyloxy)butylamine.

Ten grams of 4-(2-naphthyloxy)butylamine is added to an aqueous ethanol solution of S-methyl thiouronium sulfate (7.0 g.). Refluxing the mixture for three hours and working up as in Example 1 gives 4-(2-naphthyloxy) butylguanidine sulfate.

The sulfate salt is dissolved in ethanol and treated with sodium ethoxide to give, after filtering and evaporation, 4- Z-naphthyloxy) butylguanidine.

The free base in ethanol is treated with excess hydrogen chloride in ether to give 4-(2-naphthyloxy)butylguanidine hydrochloride.

Example 6 Chloroacetonitrile (50 ml.) is added to a refluxing methyl ethyl ketone solution of Z-thionaphthol (32 g.) and anhydrous potassium carbonate (26 g.). The mixture is refluxed for three hours and worked up as in example 3 to give Z-naphthylthioacetonitrile.

Reduction of this nitrile is accomplished with lithium aluminum hydride in dry ether to give 2-(2-naphthylthio) ethylamine.

An aqueous solution of 7.0 g. of S-methyl thiouronium sulfate and 10.0 g. of 2-(2-naphthylthio)ethylamine is refluxed for two hours. Cooling and filtering gives 2-(2- naphthylthio) ethylguanidine sulfate.

Similarly using 32.0 g. of l-thionaphthol in the above procedure furnishes 2-(l-naphthylthio)ethylguanidine sulfate.

Example 7 A mixture of 10.0 g. of N-methyl-N-(l-naphthyl)ethylenediamine (prepared by reacting N-methyl-l-naphthylamine with chloroacetonitrile and reducing the resulting nitrile with lithium aluminum hydride) and 7.0 g. of S- methyl thiouronium sulfate in water is heated at reflux for two hours. The solution is cooled and the solid product is collected by filtration and recrystallized from methanol-isopropanol to give Z-[N-methyl-N-(I-naphthyl) amino] ethylguanidine sulfate.

The sulfate salt in ethanol solution is treated with excess sodium ethoxide to give, upon concentrating and filtering, 2- [N-methyl-N-( l-naphthyl) amino] ethylguanidine.

Example 8 T 0 an aqueous solution of 13.8 g. of S-methyl thiouronium sulfate is added 18.6 g. of N-(2-naphthyl)ethylenediamine. The resulting mixture is refluxed for two hours. Cooling, filtering and recrystallizing the solid product from methanol-isopropanol yields Z-[N-(Z-naphthyl) amino] ethylguanidine sulfate.

Example 9 By the procedure of Example 3, N-butyl-l-naphthylamine is reacted with chloroacetonitrile and the product reduced to give N-butyl-N-(l-naphthyl)ethylenediamine.

Refluxing N butyl-N-(l-naphthy1)ethylenediamine with a slight excess of S-methyl thiouronium sulfate in Water gives 2-[N-butyl-N-( l-naphthyl) amino] ethylguanidine sulfate.

What is claimed is:

1. A chemical compound of the class consisting of a free base and its addition salts with pharmaceutically ac- 'ceptable acids, said free base having the formula:

/NH OANHC/ NHg in which A is an alkylene chain of 2 to 4 carbon atoms having at least 2 carbon atoms separating the hetero atoms to which it is attached.

3. A chemical compound of the formula:

5- 6 4. A chemical compound of the formula: A is an alkylene chain or" 2 to 4 carbon atoms having at least 2 carbon atoms separating the hetero atoms to which it is attached. S-A-NHO NHS 5 References Cited in the file of this patent Kuroda: C. A., vol. 28, .7862 1934 1n whrch A 1s an alkylene cham of 2 to 4 carbon atoms Kuroda 11 C A 1 29 p. 1504 (1935) having at 2; carbm atoms Separating The helm, Baltzly et al.: J.A.c.s., vol. 6 1, pp. 22314332 {1942). atoms to which 1t 15 attached Oonant et 211.: The Chemistry of Organic Compounds,

5. A chemical compound of the formula: 10 4th ed 549 (1952) R NH Conant et al.: The Chemistry of Organic Compounds,

1 N 4th ed., p. 335 (1952). H Shapiro et a1.: J.A.C.S., vol. 81, pp. 3728-3736 1959). NH; Mull et a1.: J. Org. Chem, vol. 25, pp. 1953-4956 in which: 15 V R is lower alkyl and Campbell: CA, vol. 57, 16626 (1962). 

1. A CHEMICAL COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ADDITION SALTS WITH PHARMACEUTICALLY ACCEPTABLE ACIDS, SAID FREE BASE HAVING THE FORMULA: 